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What happened to the missing cruise passengers?

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Police believe the couple went overboard about 150 kilometers off Foster, New South Wales

They were reported missing when the Carnival Spirit docked in Sydney

Authorities launched a search Thursday after two passengers went missing overnight off Australia's eastern coast.

The 30-year-old man and 26-year-old woman were reported missing when the Carnival Cruise ship Spirit docked in Sydney on Thursday morning, CNN affiliate Seven Network reported. The first clue came when they didn't claim their luggage.

Police, who have examined onboard video, believe the couple went overboard about 150 kilometers (93 miles) off Foster, New South Wales.

"We believe that they were up mid-deck, which is halfway up the side of the ship, which is quite a way to fall," said Detective Superintendent Mark Hutchings of the New South Wales Police Marine Area Command.